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It must be of type "joy_node" not "joy". In hydro it might have been changed.

It must be of type "joy_node" not "joy". In hydro it might I mean in ur launch file u have been changed.

<!-- joy node -->


<node respawn="true" pkg="joy"
        type="joy" name="turtle_joy" >
    <param name="dev" type="string" value="/dev/input/js0" />
    <param name="deadzone" value="0.12" />
  </node>

It must be

<!-- joy node -->
  <node respawn="true" pkg="joy"
        type="joy_node" name="turtle_joy" >
    <param name="dev" type="string" value="/dev/input/js0" />
    <param name="deadzone" value="0.12" />
  </node>